River-channel topography, grain size, and turbidity records from the Carmel River, California, before, during, and after removal of San Clemente Dam

The San Clemente Dam, built in the 1920s on the Carmel River in Monterey County, California, was removed during 2014 and 2015. The dam-removal project was the largest in California to date, and one of the largest in the U.S. This USGS data release presents data collected before, during, and after the removal of the dam. The data were collected to study how the river channel's topographic profiles and sediment distributions changed in response to new sediment supply after dam removal and base-level changes in the former San Clemente reservoir sediment deposit. River-perpendicular topographic profiles and bed-sediment grain size were measured at 56 transects during 4 field surveys spanning 2013 to 2017. The transect site locations were distributed along the river from near the river mouth in Carmel to upstream of the San Clemente reservoir. River turbidity and temperature were measured using a turbidity sensor deployed approximately 2 kilometers downstream of the dam site from December 2014 to July 2017. These data spanned large flood events on the Carmel River during the 2017 winter. Data were collected through a joint effort by scientists from the USGS, California State University Monterey Bay, and the National Oceanic and Atmospheric Administration.

圣克莱门特大坝（San Clemente Dam）于20世纪20年代建于美国加利福尼亚州蒙特雷县的卡梅尔河之上，于2014年至2015年间完成拆除作业。该大坝拆除工程为截至当时加州规模最大的同类项目，同时也是全美范围内规模领先的大坝拆除工程之一。本次美国地质调查局（United States Geological Survey, USGS）发布的数据集，收录了大坝拆除前、拆除过程中及拆除完成后采集的各类观测数据。本次数据采集旨在研究大坝拆除后新增沉积物补给，以及原圣克莱门特水库沉积物沉积基面变化对河道地形剖面与沉积物空间分布的影响。2013年至2017年间，研究团队共开展4次野外调查，在沿卡梅尔河从河口附近至圣克莱门特水库上游的56条河道断面处，采集了垂直于河道走向的地形剖面数据与河床沉积物粒径数据，上述河道断面的布设点位沿卡梅尔河分布，覆盖范围从卡梅尔河口附近直至圣克莱门特水库上游区域。2014年12月至2017年7月期间，研究人员在大坝坝址下游约2公里处部署浊度传感器，对河道水体浊度与水温进行连续监测，本次监测时段覆盖了2017年冬季卡梅尔河发生的多场大型洪水事件。本数据集由美国地质调查局（United States Geological Survey, USGS）、加州州立大学蒙特雷湾分校与美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration）的科研人员联合完成采集。